linux-kernel - Re: [PATCH] libertas/sdio: set ECSI and SCSI bits for 1-bit transfers

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Date:	Wed, 31 Mar 2010 11:07:06 +0200
From:	Michał Mirosław <mirqus@...il.com>
To:	Daniel Mack <daniel@...aq.de>
Cc:	linux-kernel@...r.kernel.org,
	Alagu Sankar <alagusankar@...wise.com>,
	Volker Ernst <volker.ernst@...r.com>,
	Dan Williams <dcbw@...hat.com>,
	"John W. Linville" <linville@...driver.com>,
	Holger Schurig <hs4233@...l.mn-solutions.de>,
	Bing Zhao <bzhao@...vell.com>,
	libertas-dev@...ts.infradead.org, linux-wireless@...r.kernel.org,
	linux-mmc@...r.kernel.org
Subject: Re: [PATCH] libertas/sdio: set ECSI and SCSI bits for 1-bit transfers

2010/3/30 Daniel Mack <daniel@...aq.de>:
[...]
> @@ -1022,6 +1025,27 @@ static int if_sdio_probe(struct sdio_func *func,
>        if (ret)
>                goto disable;
>
> +       /* For 1-bit transfers, we need to enable the interrupt flags in
> +        * the CCCR register. Temporarily set the function number to 0
> +        * for that. */
> +       if ((host->caps & MMC_CAP_SDIO_IRQ) &&
> +           (host->ios.bus_width == MMC_BUS_WIDTH_1)) {
> +               unsigned int num = func->num;
> +               u8 reg;
> +
> +               func->num = 0;
> +               reg = sdio_readb(func, SDIO_CCCR_IF, &ret);
> +               if (ret)
> +                       goto release_int;
> +
> +               reg |= SDIO_BUS_ECSI | SDIO_BUS_SCSI;
> +               sdio_writeb(func, reg, SDIO_CCCR_IF, &ret);
> +               if (ret)
> +                       goto release_int;
> +
> +               func->num = num;
> +       }
> +
>        card->ioport = sdio_readb(func, IF_SDIO_IOPORT, &ret);
>        if (ret)
>                goto release_int;

You should probably just use mmc_io_rw_direct() in this case instead
of abusing func->num.

Best Regards,
Michał Mirosław
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